Steam-boiler.



PATENTED JUNE 27, 1905.

T. BARROW.

STEAM BOILER.

APPLICATION FILED AUG. 20, 1904.

2 SHEETS-SHEET 1.

a 0.6. 06060 on 075' b. oooooooooooooooooocooooooooooo @3 5 {new GHQ: nu;

PATBNTED JUNE 27, 1905.

T. BARROW.

STEAM BOILER.

APPLICATION FILED AUG. 20, 1904.

2 SHEETS-SHEET 2.

NITED STATES Patented June 27, 1905.

THOMAS BARROIV, OF ST. LOUIS, MISSOURI.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent N0. 793,266, dated June 27, 1905.

Application filed August 20, 1904. Serial No. 221,505.

To all whont it may concern:

Be it known that I, THOMAS BARROW, a citizen of the United States, residing at St. Louis, State of Missouri, have invented certain new and useful Improvements in Steam-Boilers, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention has relation to improvements in steam-boilers; and it consists in the novel construction and arrangement of parts more fully set for-thin the specification and pointed out in the claims.

In the drawings, Figure 1 is a longitudinal vertical section of a triple-furnace boiler, the section being on line 1 1 of Fig. 2. Fig. 2 is a transverse section on line? 2 of Fig. I. Fig. 3 is a horizontal section on line 3 3 of 2. Fig. 4 is an enlarged sectional detail of one of the 'furnace-cylinders, showing one of the circulation-pipes attached. Fig. 5 is a crossseetion of a modified form of triple-furnace boiler. Fig. 6 is a top plan of the upper pairof furnaces shown in Fig. 5; and Fig. 7 is a eross-section of a modification. showing a twofurnace boiler.

The present invention is an improvement on the type of steam flue-boiler commonly known as the marine type, which, in addition to the upper system of fire-flues, is provided with a series of cylindrical firechambers from which the products pass into the tines forward and thence to the smoke-stack. In the prevailing construction of this type of boiler the water circulation is generally very sluggish, owing to the difliculty of its induction by the more heat imparted thereto from the furnace-walls.

It is the object of my invention, therefore, to induce and permanently insure a positive circulation from the bottom of the boiler upward in accordance with the natural principle of convection, all as will more fully appear from a detailed description of the invention, which is as follows:

Referring to the drawings, and particularly to Figs. 1 to I, inclusive, B represents the outer shell of the hoiler, f the fines, and F the furnaces, the latter being preferably corrugated transversely to allow for contraction and expansion under variable temperatures. E is the exit-flue or smoke-flue. These features are all well known and need not be dwelt upon at length in the present connection. In the prevailing constructions of boilers of this type the several furnaces F are usually separated or spaced apart from one another, thus leaving a column of water between them, in which it is diliicult to induce a circulation, the bottom of the boiler remaining comparatively cold, while the upper strata of water are hot. To remedy this defect, therefore, I connect the adjacent edges of the several furnaces by a lap-joint and to the overlapping portions I rivet the flanged ends 1 of a series of circulating-pipes 2, the intervals or spaces between the pipes being filled up with lirebrick 3, the pipes and brick collectively forming a longitudinal solid wall between the several furnaces. Into the bottoms of the pipes 2 are then inserted the pipes or extensions 2, the lower end of each alternate pipe being at a slightly-higher level than that of its adjacent one, thus forming one series with bottoms slightly elevated above those of the other series. The reason for this arrangement is that the circulation of the water is thus induced at different points of the body of water contained in the boiler, and thus becomes complete. The lower ends of the pipes 2 are supported on the shell of the boiler by means of plugs 4t, having legs or stems 5 resting on the shell.

In the operation of the boiler the products of combustion in the several furnaces F serve to heat the pipes 2, the heat thus imparted thereto in turn being communicated to the column of water in the pipe, thereby inducing a circulation in the body of water below the fines f, the water taking the course as indicated by the feathered arrows in Fig. 2, suitable openings (3 being formed at the lower ends of the pipes 2 for the rising currents of water.

In the arrangement shown in Figs. 5 and 6, where the furnaces F F are disposed at a higher level and on either side of the furnace F thereby necessitating an increased space between the furnaces F F, I not only provide pipes 2 for inducing circulation, but provide the latter with extensions 2", suitably curved about the periphery of the furnace F. In addition I connect the overlapping ends of the upper furnaces with tubes 25 to assist in the circulation, said tubes becoming heated more or less by the walls of the furnaces F F.

In Fig. 7 I show a two-furnace boiler, the furnaces F being two in number instead of three, as shown in the first four figures, but otherwise being in all respects the same. Thus the pipes 2 are in the nature of conduits Whose walls become heated by direct contact with the products of combustion generated in the furnaces, each conduit enveloping a column of water, which in turn becomes heated, thereby rising and inducing a circulation in the body of water below, this induction being rendered more positive and perfect by the extension-pipes 2, the water in which becomes an extension 'of the column confined in the pipes 2. The pipes or conduits 2, being connected, as they are, at opposite ends to the overlapping edges of the shells forming any two contiguous furnaces, serve in the capacity of hollow braces distributed along the plane of division between said furnaces, and thus form a series of heat-conducting sections of the division-wall between any two furnaces. These heat-conducting sections are thus exposed on one side to the action of the products of combustion from the furnaces, of which they form a part, and on the opposite or inner side to the water circulating through them. These conduits, While here shown cylindrical, may of course be prismatic or polygonal, as is obvious. So, too, may other details here shown be qualified without in any wise departing from the nature or spirit of my invention. As seen from the foregoing, the conduits or pipes 2 are disposed along the plane or wall of separation between two contiguous furnaces, said wall in the present instance being made up of the series of pipes 2 and the brick 3.

While the furnaces F F F are herein shown as cylinders containing a single firechamber, it is to be understood that any character of furnace is contemplated by the present inventionthat is to say, the fact that such a furnace might be provided with a series of fire-flues, as in the ordinary locomotive or other flue boiler, would not remove it from the pale of the present invention.

Having described my invention, what I claim is 1. In a boiler having a series of furnaces disposed therein, a series of conduits distributed along the plane of separation between two adjacent furnaces and forming a part of the division-wall disposed in said plane, extensions from said conduits leading to the shell of the boiler, the conduits and extensions being in open communication with the water in the -boiler, substantially as set forth.

2. In a boiler having a series of furnaces disposed therein, a series of conduits distributed along the plane of separation between two adjacent furnaces and forming a part of the division-wall disposed in said plane, extensions leading from the conduits and divided into series terminating at different levels in the boiler, the conduits and extensions being in open communication with the water in the boiler, substantially as set forth.

3. A boiler comprising a shell, a series of parallel furnaces disposed therein, and having their outer walls suitably connected to one another, a series of pipes connected at opposite ends to said walls and disposed along the line of separation between two adjacent furnaces, extension-pipes depending from the first-mentioned pipes and extending below the furnaces to points in proximity to the bottom of the boiler, said pipes and their extensions being open at both ends for inducing an uninterrupted circulation of water therethrough, substantially as set forth.

4. In a boiler having a series of furnaces disposed therein, a series of conduits distributed along the plane of separation between two adjacent furnaces and forming a part of the division-wall disposed in said plane, and depending extensions for said conduits leading in proximity to the shell of the boiler, said conduits and extensions being jointly in open communication with the Water in the boiler, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

THOMAS BARROW.

WVitnesses:

EMIL STAREK, G. L. BELFRY. 

